Rivet.



AgH. FARNELL & S. BARRON.

RIVET. APPLICATION FILED 13110.21, 1907. RBNBWED MAB.. 1, 1909.

Patented Apr. 13, 1909.

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y UNTTED STATE@ DATEN? OFTQE,

ALFRED HENRY FARNELL,

OF LENZIE, AND SAMUEL BARRON, OF GLASGOW, SCOTLAND, ASSIGNORS TO JOHN WILLIAM PERCY SCOTT,

OF GLASGOW, SCOTLAND.

RIVE T rateneea April 13, 1909.

Application filed December 21, 1907, Serial No. 407,596. Renewed March 1, 1909. Serial No. 480,757.

To all whom 'it may concern:

Bc it known that we, ALFRED HENRY FAR- xnLL and SAMUEL BARRON, both subjects of the King of Great Britain, residing in Lenzie, Dumbartonshire, and Glasgow, Lanarkshire, respectively, both in Scotland, have invented a new and useful Improvement in Rivets, of which the following is a full and complete specification.

Our invention relates to improvements in rivets for uniting metal plates used in constructional metal work, such as the girders, columns, and the like, of railway and other bridges, the object being to provide means for not only uniting the plates together, but also for holding and securing cement, concrete, or other protective coverings to the eX- posed parts of such metal work, whereby such parts may be protected from smoke, rain, or other destructive agent.

In carrying out the present invention, it is proposed to use the improved rivet for the purpose before referred to, alternately with the ordinary rivet, though all the rivets employed may be of the improved construction if desired, but this is not obligatory.

The invention consists in so forming the head of the rivet that a flange is left eX- tending any desired distance from the plate, the size of the flange and the distance from the surface of the plate being determined by the amount of concrete it isv desired to employ, and the use to which the girder or other part covered is to be subjected.

In the accompanying drawings which illustrate this invention Figure 1 is a sectional elevation on line y-y. Fig. 2 showing one application of the invention. Fig. 2 is a sectional plan on line :o-m Fig. 1. Eig. 3 shows in elevation and plan a full sized rivet. Fig. l an elevation and plan of the invention as applied to a screw bolt, and Fig. 5 a part sectional elevation of a modification.

As at present constructed, the rivets consist of a straight shank provided with a cup or spherical head of well-known form. According to the present invention, however, the head of the rivet is formed fiat as shown at a, and of a diameter say two and a half times that of the shank Z), between the underside of the head and the shank proper is a part c of slightly larger diameter than the shank, and the length of this part determines the distance of the enlarged head o, from t-he face of the plate cl.

ln practice, the enlarged part c of the shank Z) bears against the face of the plate l and the other end is then formed in the wellknown manner. .Vhen the girder, or the like, is ready for covering, the usual boarding is placed in position and the concrete o filled in, in such a manner that the projecting heads a of the rivets are embedded therein as shown in Fig. 1, and form a 'retaining means for the concrete when set. The number of hese retaining devices or rivets and the particular position may be varied as desired, as may also the shape of the retaining flange a'.

Though the invention has been particularly described with reference to rivets, it may, if desired, be applied to screw bolts as shown in Fig. il, in which case the part C would be square so as to permit of the bolt being gripped by a wrench.

lhile the parts a and e are preferably formed in one with the rivet, bolt, or the like, they may, if desired, be separate therefrom, and its utilization in connection with an ordinary screw bolt is shown in Fig. 5, in which a washer g takes the place of the flange a and a loose collar t acts as the disstance piece between the plate of the girder, or the like, and the washer g which rests on the head t' of the bolt.

While the enlarged head has been described as being flat, we do not limit ourselves to the precise shape of the extending portion as the same may be varied to suit the various requirements to which they may be put.

1f desired, rivets or bolts constructed in accordance with this invention may be employed in conjunction with any of the known means, such as bands or strands of wire, or the like, but these are not obligatory.

Ve are aware that it has heretofore been proposed to secure cement, concrete, or other protective coverings to girders, and the like, by means of bands of metal, single strands of wire or what is known as expanded metal, the method of attachment of such devices to the part being covered varying with the form of such article, but great difficulty has been experienced in retaining such devices 1n correct position While the concrete7 or other protective covering, is being filled in. It has also been proposed in the construction tlght joint at the corners, to connect the Various plates and angle iron by means of rivets having' heads so formed as to leave spaces bet-Ween thein and the adjacent surface of the plate or angle iron, into which spaces the enainel or other material will enter, anch when set7 be lirinly locked in position. It will be observed, however, that our improved. rivet differs from all of these prior devices in that it is provided with an over-hanging flange a; and an enlargement c joined to said flange by an easy curve against which the cement or concrete covering may set. It is also provided with a straight shank joined to said enlargement by an abrupt shoulder; the said shank being' of sufficient length to pass through a plurality of parts of a metal girder, and having a smooth flat end adapted to be upset and thereby formed into a head resting against the surface of' one part of said girder while saidv shoulder rests against the surface of another part, and said flange a stands up above and overwhangs the last mentioned surface, and serves to hold any i r y l cement or concrete that :may be applied thereto. Y

llVhat we claim is r- A rivet for securing a protective covering to constructional nietal work, provided with an overhanging flange; an enlargement joined to said flange by an easy curved surface against which said covering may set, and a straight shank joined to said enlarge` nient by a flat surface constituting an abrupt shoulder; said shank being of a length suflicient to pass through a plurality of parts of a inetal girder and having an end adapted to be upset and formed into a head for firmly holding all of' said parts between itself and said shoulder, while said flange remains sufliciently separated from the surface to be protected and to enable the said covering to set between the saine and said surface, substantially as described.

In testimony whereof we have hereunto set our hands in t-he presence of two wit- HGSSGS.

W'itnesses A. KNIGHT CROAD, ROBERT THOMSON. 

